Gaza City (CNN) - Five people were killed Monday in Gaza, the latest deaths in days of airstrikes that marked the worst escalation of violence in the coastal territory in months, Palestinian officials said.

Israel has said its airstrikes have targeted militant rocket launching sites across the Palestinian territory in response to more than 100 rocket attacks from Gaza into Israel since Friday.

At least 23 people have been killed in strikes since Friday, while at least 75 people have been wounded.

Three civilians and two militants were killed in what Palestinian medical officials said were Israeli airstrikes Monday.

Hamas says it and other Palestinian factions have agreed to stop firing into Israel after Hamas claimed responsibility forÂ shooting a missile that struck an Israeli bus Thursday.

The Hamas strike critically wounded a teenage boy on his way home from school.Â After not claiming responsibility for the attack earlier in the day, Hamas on Thursday night sent a message to reporters saying the strike was in retaliation for the killing of three Hamas leaders last weekend.

After the attack Thursday, and the firing of numerous mortars into Israel, the Israel Defense Forces "targeted nine terror-activity sites in the Gaza Strip," the IDF said in a news release. A military spokeswoman said later that IDF aircraft targeted three smuggling tunnels in southern Gaza in addition to the nine targets mentioned earlier.

The additional IDF strikes hit shortly after Hamas' cease-fire was scheduled to take effect, according to Hamas' Interior Ministry.

said it will stop after talking with other Palestinian factions following , according to Hamas' Interior Ministry.

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